Originally Posted by Mark12547
I my case, I finally settled on setting the DVR to output 1080p to the TV, and set the aspect ratio on the TV to "just scan" (it will display 4:3 and 16:9 images without overscan when set to "aspect ratio: just scan"). ...
A couple days ago I revisited the HD DVR settings and got a different set of settings that seem to also work for the HD DVR and my bedroom TV, this time leaving most of the deinterlacing and all the scaling to the TV, except for SD 480i, which I am having the DVR deinterlace and feed 480p to the TV and then the TV will rescale that 480p format to its native 768p format..
Through trial and error, I found that when the TV received a 480i signal through the HDMI cable, the TV forgot that I had set the "Ratio: just scan" (LG-speak for no overscan) and it also stretched the 4:3 image to fill the screen, horribly distorting it; and switching back to a HD channel would have overscan. (How many of us want to grab the DVR remote to change the channel or start playing different content, and then have to reach for the TV remote to adjust the "Ratio" (zoom/aspect ratio) on just about every channel change?)
However, when I had set the HD DVR as "HDMI/YPbPr mode" to "Native" (that DVR-speak for sending to the TV the same HD format the channel is broadcasting in), and then use the DVR's "Advanced HDMI" screen to deselect 480i as one of the HD Formats that my TV can receive (leaving 480p, 720p, 1080i & 1080p at various frame rates as formats the TV can receive), the TV then receives just the now-480p, 720p, or 1080i format, remembers I had configured the port to "Ratio: just scan" (no overscan, so I view the entire HD image) when on HD stations (or switching back to a HD station) and properly displays SD stations as 4:3 but it enables overscan until I switch back to a HD program. (In the case of SD, a bit of overscan is nice because a couple of the SD stations I normally watch have some garbage white and black segments on the top line, and overscan pushes that line out of view.)
I'm going to try it this way for a while. So far, leaving all rescaling to my 768p TV works at least as well as having the HD DVR rescale to 1080p and the TV rescale down to 768p, and I think the SD channels and 720p channels are just a bit crisper this way, probably because I had eliminated the DVR's intermediate rescaling step.
One thing I don't like is that when switching from SD to a HD format, or switching between HD formats, there is a delay of about 1 second or so before the TV is handling the new format, which wasn't there when the DVR was formatting all signals to the same HD format. But since I tend to record and watch later, rather than channel surf, the delay is usually just at the beginning of watching a show. (See: List of current high-definition channels) If the second of no image when changing to a different HD format gets too irritating, I can quickly change the HD DVR back to rescaling everything to 1080p.
I can't eliminate the SD channels from my viewing because at present there is some content that is available only on the "classic" TV networks (often broadcasted OTA as digital subchannels) like MeTV, Antenna TV, and THiS TV, and on other SD-only channels. So, when searching for a combination of settings that work for my bedroom TV, the 480i channels are the ones that complicate the issue. I am glad I now have a couple ways of working around the 480i complications: either rescale everything to a HD format such as 1080p or, now, I know I can also configure the DVR to eliminate 480i output on HDMI so 480i channels go out on the HDMI cable to the TV as 480p.
Edited by Mark12547 - 11/30/13 at 6:19pm